Understand that Cat 9120 is the replacement for AP2802. Our customer has the WLC 5520 as foreign controller and WLC 2504 a guest mobility anchor. Can the 9120 fit into this environment, or the WLC 2504 (guest anchor) has to be changed ? Our design in Figure 10-1 Centralized Controller Guest Access https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-1/Enterprise-Mobility-8-1-Design-Guide/Enterprise_Mobility_8-1_Deployment_Guide/WirelessNetwork_GuestAccessService.html
Understand that it is support based on the IRCM Table22 https://www.cisco.com/c/en/us/td/docs/wireless/compatibility/matrix/compatibility-matrix.html#pgfId-149658
WLC 5520 has to be upgraded to at least v8.9 to support AP9120 and WLC 2504 remains at v8.5.
Any issues if there is a version difference between 5520 and 2504 ?
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